The first thing you were probably asking yourself is: so can they now try him for murder? I thought about blogging this earlier, but then I thought about having lunch. And then I did some other stuff. At some point in there, Eugene Volokh came along and said about the same thing I would have said. (See? Sometimes if you procrastinate, someone else will come along and do the job for you!)
The short answer is: no, they can’t — mainly because the jury already found him not guilty by reason of insanity, and that finding would translate to any murder prosecution. So, while it is theoretically possible to prosecute someone for murder after they are prosecuted for attempted murder — even if they have been acquitted, depending on the defense they used! — it’s not in this case.
P.S. If you’re interested, I previously discussed the way these rules played out in the movie “Fracture” in this post from 2007. That post, like this one, used a Eugene Volokh post as its springboard.
P.P.S. Eugene also discusses something called the “year and a day rule” pursuant to which, in many jurisdictions, there can be no murder prosecution unless the death occurred within a year and a day of the act that caused it. In California, if memory serves, there is a different rule: after three years there is a presumption that the defendant’s act did not cause the death — but that presumption can be rebutted by evidence.